FR2446797A1 - Safety nut assembly for vehicle lifting installation - interrupts motor supply current to threaded shaft if operating distance between two nuts decreases - Google Patents

Safety nut assembly for vehicle lifting installation - interrupts motor supply current to threaded shaft if operating distance between two nuts decreases

Info

Publication number
FR2446797A1
FR2446797A1 FR7901975A FR7901975A FR2446797A1 FR 2446797 A1 FR2446797 A1 FR 2446797A1 FR 7901975 A FR7901975 A FR 7901975A FR 7901975 A FR7901975 A FR 7901975A FR 2446797 A1 FR2446797 A1 FR 2446797A1
Authority
FR
France
Prior art keywords
nut assembly
nut
threaded shaft
vehicle lifting
supply current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
FR7901975A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR7901975A priority Critical patent/FR2446797A1/en
Publication of FR2446797A1 publication Critical patent/FR2446797A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
    • B66F7/025—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars screw operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • F16H25/2472—Safety nuts

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Automatic Assembly (AREA)

Abstract

The vehicle lifting system comprises a column containing a screw which is rotated to raise or lower a load carrier. A nut assembly (16) in a load carrying carriage (15) is driven up or down a column by a threaded shaft (11) driven by an electric motor (18) and gear assembly. A second nut assembly (33) is located below the load carrying nut. The distance between the carrier nut and the safety nut assembly is monitored to stop the movement if the distance is reduced. In the event of failure of the thread three fingers (35, 36, 37) on another shaft are engaged by an oscillating lever (41) whose tip (44) is normally engaged between the two nut assemblies. This lever tips to displace the second shaft to open a switch in the motor circuit to stop carriage movement.
FR7901975A 1979-01-16 1979-01-16 Safety nut assembly for vehicle lifting installation - interrupts motor supply current to threaded shaft if operating distance between two nuts decreases Pending FR2446797A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7901975A FR2446797A1 (en) 1979-01-16 1979-01-16 Safety nut assembly for vehicle lifting installation - interrupts motor supply current to threaded shaft if operating distance between two nuts decreases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7901975A FR2446797A1 (en) 1979-01-16 1979-01-16 Safety nut assembly for vehicle lifting installation - interrupts motor supply current to threaded shaft if operating distance between two nuts decreases

Publications (1)

Publication Number Publication Date
FR2446797A1 true FR2446797A1 (en) 1980-08-14

Family

ID=9221215

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7901975A Pending FR2446797A1 (en) 1979-01-16 1979-01-16 Safety nut assembly for vehicle lifting installation - interrupts motor supply current to threaded shaft if operating distance between two nuts decreases

Country Status (1)

Country Link
FR (1) FR2446797A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332758A1 (en) * 1988-03-16 1989-09-20 Zippo Gesellschaft Für Hebetechnik Mbh Lifting-platform for motor vehicles
EP0475901A1 (en) * 1990-09-07 1992-03-18 Mesh Ag Lifting post

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1475904A (en) * 1966-02-23 1967-04-07 Tecalemit Improvements to vehicle lifts
CH437700A (en) * 1965-07-22 1967-06-15 Villars Julio Car lift
FR1576457A (en) * 1967-05-05 1969-08-01
CH526463A (en) * 1970-11-17 1972-08-15 Hywema Josef Schwahlen Fa Movable device for reaching under and then lifting loads
DE2346186A1 (en) * 1973-09-13 1975-03-20 Hofmann Maschf Geb Safety device for an elevating platform - lifting nut runs with spaced capture nut on spindle and on change in nut spacing capture nut engages stop
DE2347130A1 (en) * 1973-09-19 1975-04-03 Romeico Gmbh Motor vehicle lifting platform with one or two columns - has lifting spindle and safety link between load carrying and safety nut
FR2358084A7 (en) * 1976-07-06 1978-02-03 Hofmann Gmbh & Co Kg Maschinen Lift mechanical safety device - has catch on lifting nut engaging in groove in screwed spindle
FR2369204A1 (en) * 1976-10-29 1978-05-26 Nussbaum Kg Fertigungstechnik SCISSOR LIFT
FR2382400A1 (en) * 1977-03-03 1978-09-29 Citroen Sa Road vehicle electrically driven double ball screw jack - synchronises screws by comparing output from screw driven generators

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH437700A (en) * 1965-07-22 1967-06-15 Villars Julio Car lift
FR1475904A (en) * 1966-02-23 1967-04-07 Tecalemit Improvements to vehicle lifts
FR1576457A (en) * 1967-05-05 1969-08-01
CH526463A (en) * 1970-11-17 1972-08-15 Hywema Josef Schwahlen Fa Movable device for reaching under and then lifting loads
DE2346186A1 (en) * 1973-09-13 1975-03-20 Hofmann Maschf Geb Safety device for an elevating platform - lifting nut runs with spaced capture nut on spindle and on change in nut spacing capture nut engages stop
DE2347130A1 (en) * 1973-09-19 1975-04-03 Romeico Gmbh Motor vehicle lifting platform with one or two columns - has lifting spindle and safety link between load carrying and safety nut
FR2358084A7 (en) * 1976-07-06 1978-02-03 Hofmann Gmbh & Co Kg Maschinen Lift mechanical safety device - has catch on lifting nut engaging in groove in screwed spindle
FR2369204A1 (en) * 1976-10-29 1978-05-26 Nussbaum Kg Fertigungstechnik SCISSOR LIFT
FR2382400A1 (en) * 1977-03-03 1978-09-29 Citroen Sa Road vehicle electrically driven double ball screw jack - synchronises screws by comparing output from screw driven generators

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332758A1 (en) * 1988-03-16 1989-09-20 Zippo Gesellschaft Für Hebetechnik Mbh Lifting-platform for motor vehicles
EP0475901A1 (en) * 1990-09-07 1992-03-18 Mesh Ag Lifting post

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